Wikimedia Commons Lake ice quality is degrading as the world warms, putting hockey players, ice skaters, and ice truckers at risk, research suggested. There are two main kinds of freshwater ice: White ice, made opaque by the prevalence of air bubbles, and black ice, which is clear, dense, and able to bear greater loads. Safe skating requires four inches of black ice, but scientists found that unpredictable warmer winter weather is creating thinner layers of black ice and sometimes thicker layers of white ice. Cold countries such as Canada regularly see people drown from falling through ice, and the growth of white ice is also a problem for ecosystems because it blocks sunlight needed for photosynthesis in the water below. |